XADM: High CPU in Store.exe with Incorrectly Formatted Attachment

ID: Q183633

The information in this article applies to:

Microsoft Exchange Server, versions 5.0, 5.5

SYMPTOMS

When you monitor the activity of Store.exe using various tools, including Performance Monitor, Store.exe runs near or at 100 percent CPU usage.

CAUSE

The messaging client is improperly formatting a message containing a MIME attachment. This can occur for messages containing attachments that contain a left parenthesis "(" within the file name but without the right or closing parenthesis ")". This is interpreted as a comment rather then the file name, and the store continuously searches for the closing parenthesis.

For example:

--PART.BOUNDARY.mailhub.4aba.34918213.0001
Content-Type: application/octet-stream
Content-Transfer-Encoding: base64
Content-Disposition: attachment; filename=(JPEG-IM.BMP <-HERE *****
Content-Description: (JPEG-IM.BMP
FTBP-Modification-Date: 12 Dec 2017 10:02:00 Z
FTBP-Object-Size: 167710

It is possible to check the files in the IMCDATA\IN or IMCDATA\OUT subdirectories for the presence of messages that contain attachments with a ( in the file name. These files are text files. There is no need to check the archive directories underneath IN or OUT.

RESOLUTION

Exchange Server 5.0

A supported fix that corrects this problem is now available from Microsoft, but it has not been fully regression tested and should be applied only to systems experiencing this specific problem. If you are not severely affected by this specific problem, Microsoft recommends that you wait for the next Microsoft Exchange Server version 5.0 service pack that contains this fix.

To resolve this problem immediately, contact Microsoft Product Support Services to obtain the fix. For a complete list of Microsoft Product Support Services phone numbers and information on support costs, please go to the following address on the World Wide Web:

http://www.microsoft.com/support/supportnet/overview/overview.asp

The English version of this fix should have the following file attributes or later:

Component: Information Store

File name	Version
Mdbmsg.dll	5.0.1461.92
Store.exe	5.0.1461.92

Exchange Server 5.5

To resolve this problem, obtain the latest service pack for Microsoft Exchange Server version 5.5. For additional information, please see the following article in the Microsoft Knowledge Base:

Q191014 XGEN: How to Obtain the Latest Exchange Server 5.5 Service Pack

The English version of this fix should have the following file attributes or later:

Component: Information Store

File name	Version
Store.exe	5.5.2144.0

STATUS

Microsoft has confirmed this to be a problem in Microsoft Exchange Server versions 5.0 and 5.5. This problem was first corrected in Microsoft Exchange Server version 5.5 Service Pack 1.

Additional query words: spin hog

Keywords :
Version : winnt:5.0,5.5
Platform : winnt
Issue type : kbbug